You'll see both numbers on every LBO summary slide. But ask three different PE associates which one matters more, and you'll get three different answers — usually wrong.
Here's what each actually tells you, and when to trust which.
The 30-second answer
- MOIC = how many times you multiplied your money. 3× means $1 went in, $3 came out.
- IRR = how fast you multiplied it. The annualized rate of return that discounts your exit cash flows back to your entry equity check.
A 3× MOIC over 5 years is a 24.6% IRR. A 3× MOIC over 10 years is only 11.6%. Same multiple, very different deal.
Why MOIC fools people
I once watched a junior associate pitch a deal projecting 3.5× MOIC. The senior partner asked one question: "Over how long?"
The answer was 7 years. The IRR was 19.7%.
That's a perfectly fine deal — but the associate had been pitching the MOIC like it was best-in-class. PE funds report IRR to LPs because investors think in annual returns, not multiples on contributed capital. Don't ever quote MOIC without saying the hold period in the same breath.
Look at how a 5× MOIC scales with hold:
| MOIC | Hold Period | IRR |
|---|---|---|
| 5× | 3 years | 71.0% |
| 5× | 5 years | 37.9% |
| 5× | 7 years | 25.8% |
| 5× | 10 years | 17.5% |
The Hilton case study — when long hold is the right call
The textbook illustration of why hold period matters is Blackstone's 2007 buyout of Hilton Hotels. The deal closed at a $26.0B enterprise value on $1.2B of LTM EBITDA — a 21.7× entry multiple, financed at 8.4× leverage.
That entry multiple looks insane in isolation. But here's what happened over the next 11 years:
| Year | Event | Detail |
|---|---|---|
| 2007 | Close | $26B EV at 21.7× EBITDA, 8.4× leverage |
| 2008–09 | Crisis | Hotel demand collapsed; covenants restructured in 2010 |
| 2013 | IPO | $32B EV at IPO; first tranche of exit |
| 2018 | Final sell-down | Total proceeds ~$14B across all sell-downs |
Final returns:
- MOIC: 2.5× — solid, not heroic
- IRR: 18.7% — solid, not heroic
- Hold: 6.2 years weighted average — long
But here's the thing: this was called "the greatest private equity deal of all time" by the trade press. Why? Because the alternative was forced liquidation in 2009 at a fraction of the cost basis. The IRR isn't a 40% home run — but the MOIC over 6 years compounded into ~$8B of fund profit, the largest single dollar return in PE history at the time.
The Hilton case proves both metrics matter, separately. MOIC alone hides that the IRR is below most fund targets. IRR alone hides that the absolute dollar return was historic. LPs look at both, plus DPI.
Why IRR fools people too
IRR has its own pathology: it's distorted by early cash flows.
If you can return $100 in year 1 of a 10-year hold and the rest at exit, the IRR pops dramatically — even though you've only banked a fraction of the total return.
This is why a deal with a recap dividend in year 2 looks unreal on paper. The IRR includes that early refinanced cash as if it were realized exit proceeds. But the LP can't redeploy it into the same opportunity.
A related trap: dividend recaps in years 1–2 can spike IRR to >100% if you're not careful with the math. Your IC will smell that and ask hard questions.
How PE pros actually think about it
Senior partners and LPs run BOTH numbers, plus a third one: DPI (distributions to paid-in). And they benchmark IRR against fund vintage peers.
Practical rules of thumb:
- MOIC matters more for high-conviction holds. Hold a great asset 8+ years and MOIC compounds; IRR will look mediocre but DPI is enormous. Hilton is the canonical example.
- IRR matters more for opportunistic plays. Short-hold deals (refinancings, recaps, quick flips) live and die by IRR. A 1.6× over 18 months (35% IRR) often beats a 2.5× over 4 years at the fund level.
- In any pitch deck, both metrics belong on the same line — with the hold period explicit.
What you actually want in your model
Most LBO templates show MOIC and IRR at base case only. That misses the point. You want:
- A 5×5 sensitivity table of IRR by (exit multiple) × (exit year)
- A second 5×5 of MOIC on the same axes
- The implied multiple required at exit to hit a 2.5× MOIC at the LP IRR threshold
Our All-in-One PE Model has all three built into the DCF_10 and LBO sheets — dual 5×5 sensitivity tables for both Firm Value and Equity Value, plus an implied-multiple solver. You can see the full preview if you want to verify the sheet structure before buying.
Bottom line: if you only quote one number, quote IRR with the hold period. If you only think one number, think MOIC over a realistic hold. If you do both, you're doing it right.
Sources:
- Hilton S-1 Filing (Dec 2013), SEC EDGAR — entry multiple and original transaction details
- Bloomberg, "How Blackstone Made One of the Greatest Deals in PE History," May 2018 — total proceeds figure
- Blackstone Q4 2018 Earnings Release, IR.Blackstone.com — final exit IRR